使用python查找多项式系数

Question

我有以下两个列表：

first = [1,2,3]
second = [6,7,8]

现在，我想将两个列表中的项目添加到新列表中。

输出应为

three = [6, 7, 8, 12, 14, 16, 18, 21, 24]

Answer 1

列表理解

您可以使用此列表理解：

new = []
for i in extract:
    if i in list(word):
        new.append(i)

new = ''.join(new)
print(new)

three = [i*j for i in first for j in second] # [6, 7, 8, 12, 14, 16, 18, 21, 24]

或者，使用itertools（尽管我不确定在这种情况下是否可以节省性能）：

itertools.product

from itertools import product three = [i*j for i,j in product(first,second)] # [6, 7, 8, 12, 14, 16, 18, 21, 24]

或者用numpy：

numpy